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Chemistry > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

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1
Q

which cations do you test for using the flame method?

A

Li+, Na+, K+, Ca2+, Cu2+

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2
Q

what cations do you test for using NaOH solution?

A

NH4+, Cu+, Fe2+, Fe3+, Al3+, Ca2+

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3
Q

Li+ flame colour?

A

(crimson) red

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4
Q

Na+ flame colour?

A

orange

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5
Q

K+ flame colour?

A

lilac

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6
Q

Ca2+ flame colour?

A

brick red

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7
Q

Cu2+ flame colour?

A

green

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8
Q

ammonia test?

A

mix NaOH, heat it up over bunsen burner, and red litmus paper turns blue if positive

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9
Q

Cu2+ and NaOH

A

creates a blue ppt = Cu(OH)2

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10
Q

Fe2+ and NaOH

A

creates a green ppt = Fe(OH)2

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11
Q

Fe3+ and NaOH

A

creates a brown ppt = Fe(OH)3

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12
Q

Al3+ and NaOH

A

creates a white ppt, but does dissolve excess - so becomes colourless again

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13
Q

Ca2+ and NaOH

A

creates a white ppt, but doesn’t dissolve excess - stays white

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14
Q

how do you test for sulphates?

A

adding barium chloride and HCl

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15
Q

why is an acid added for a sulphate test?

A

gets rid of any unwanted carbonate ions

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16
Q

what happens if it is positive for sulphate?

A

white ppt

17
Q

how do you test for halides?

A

add silver nitrate and nitric acid

18
Q

what colour ppt is made when positive for Cl-

A

white ppt

19
Q

what colour ppt is made when positive for Br-

A

cream ppt

20
Q

what colour ppt is made when positive for I

A

yellow ppt

21
Q

how to test for carbonates?

A

add limewater Ca (OH)2 and HCL

22
Q

what happens when the test is positive for carbonates?

A

milky/cloudy white & effervescence

23
Q

test for hydrogen

A

squeaky pop test

24
Q

test for oxygen

A

lit splint test

25
Q

test for carbon dioxide

A

limewater

26
Q

test for water

A

1) copper sulphate
2) cobalt chloride paper blue to pink

27
Q

test for chlorine

A

damp blue litmus paper turns red then white (bleaches)

28
Q
A

Chemistry (3 decks)

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